International Business Machines Corporation

Globalfoundries Inc.

Joseph M Swingler

Thomas W Bish

Katsuyoshi Katori

Takeshi Nohta

Koichi Masuda

Erika Dawson

Norie Iwasaki

Jonathan Wayne Peake

Gregory Tad Kishi

Mark Albert Reid

Lourie Goodall

Rufus-John Yeisuke Twito

Kerri Renee Shotwell

Thirumale N Niranjan

David C Reed

Max D Smith

Joseph W Dain

Lourie A Bryan

Igor I Ageyev

Edward Lin

Gary Anna

Tomokazu Nakamura

David Alan Brettell

Michael Wayne Young

Michael William Wood

Katja I Denefleh

Kimberly A Bortz

Emmanuel Barajas Gonzalez

James Arthur Fisher

Gavin Stuart Johnson

Robert Stanley Gensler, Jr

Ralph Thomas Beeston

Duke Andy Lee

David Michael Morton

Yun Mou

Edward Hsiu-Wei Lin

Lih-Chung Kuo

Alan J Fisher

Sangram Singh Ghoman

Thomas Holderness Daily

Vanessa R Earle

Jonathan Michael Hale

Takshi Nohta

Frederick G Stock

Jonathan Wayner Peake

Provided are a computer program product, system and method for restoring volumes in a data storage system. A virtual restoration of a volume of data stored in storage is performed using a target volume. In one embodiment, the virtual restoration includes configuring metadata associated with the target volume, to map the target volume to the recover volume as a virtual restoration of the recover volume. In response to a request by a host for data stored on the recover volume, physical restoration of data of the recover volume is performed using the target volume. In one embodiment, the physical restoration includes transferring data to the target volume from the recover volume to which the target volume is mapped by the virtual restoration. In addition, transferred data is relabeled as target volume data instead of recover volume data.

Data storage volume recovery management

A computer-implemented method according to one approach includes receiving requests to perform data operations on a first storage container, where the data operations include a read operation and a write operation. It is determined whether first data stored on the first storage container is set to a read-only status. In response to determining that the first data is set to the read-only status, the read operation is allowed to be performed on the first container for reading the first data, and the write operation is performed on a second storage container. Moreover, in response to determining that the first data is set to the read-only status, it is determined whether the read-only status has been withdrawn. In response to determining that the read-only status has been withdrawn, further write operations are allowed to be performed on the first storage container.

Utilizing statuses to preserve a state of data during procedures such as testing without causing functional interruptions

Provided are a computer program product, system and method for retaining versions of an object. Changes are appended to a current version object resulting in a new current version object and a most recent previous version object comprising the current version object before the changes were appended. Version metadata, for each previous version object, includes the most recent previous version object, indicating an offset in the new current version object at which the previous version object can be recovered. The most recent previous version object is deleted and the version metadata, for the most recent previous version object after the most recent previous version object is deleted, is retained to allow recovery of a previous version object from the new current version object using the offset in the version metadata.

Managing versions of objects resulting from appending data for space efficiency

A computer-implemented method, according to one embodiment, is for managing data received at a storage device. The computer-implemented method includes: receiving data management policies, and receiving two or more connection names from a host. Each of the connection names is correlated with one or more of the data management policies. Moreover, a connection path which extends between the storage device and the host is created. The connection path also has a connection name which corresponds thereto. Data is received along the connection path, and the connection name which corresponds to the connection path is matched to one of the connection names received from the host. Furthermore, the received data is processed according to the one or more data management policies that are correlated with the matching one of the connection names received from the host.

Associating data management policies to portions of data using connection information

A computer-implemented method, according to one embodiment, includes: receiving a request for a set of data at a first data storage tier, looking up corresponding metadata to each portion of the requested set of data, using the metadata to recall each of the portions of the requested set of data from object storage, and using the portions of the requested set of data to recompile a master object, the master object having a 1-to-1 mapping to the requested set of data. Other systems, methods, and computer program products are described in additional embodiments.

Tape reconstruction from object storage

A method for resynchronizing data repositories in a high availability storage environment includes maintaining, in a first gateway server, a first journal that records operations that are performed for a first set of objects. The method further maintains, in a second gateway server, a second journal that records operations that are performed for a second set of objects. The method communicates, from the first gateway server to the second gateway server, any operations that are performed by the first gateway server for objects in the second set, so that these operations may be recorded in the second journal. The method further communicates, from the second gateway server to the first gateway server, any operations that are performed by the second gateway server for objects in the first set, so that these operations may be recorded in the first journal. A corresponding system and computer program product are also disclosed.

Data synchronization in high availability storage environments

A computer-implemented method, according to one embodiment, includes: receiving a data volume having data from multiple tenants therein. Data in the data volume is separated into objects using tenant identifiers from metadata corresponding to portions of the data, where each object corresponds to a respective tenant. The objects are stored in object storage, and the metadata is updated with information pertaining to the object which the data in the data volume was separated into. Moreover, updating the metadata with the information is performed after the data in the data volume has been separated. Other systems, methods, and computer program products are described in additional embodiments.

Tape processing offload to object storage

A dynamic premigration protocol is implemented in response to a secondary tier returning to an operational state and an amount of data associated with a premigration queue of a primary tier exceeding a first threshold. The dynamic premigration protocol can comprise at least a temporary premigration throttling level. An original premigration protocol is implemented in response to an amount of data associated with the premigration queue decreasing below the first threshold.

Dynamic premigration throttling for tiered storage

In one embodiment of split data migration in accordance with the present description, to migrate the data of a volume or other data unit which has been previously mirrored from a primary data storage system to a secondary data storage system, the data unit is split into two or more parts. One part is migrated from the primary data storage system to a migration target storage system, and another part is migrated from the secondary data storage system, to the same, common migration target storage system. In this manner, the migration workload of migrating a unit of data may be split between the primary and secondary storage systems, reducing the impact of migration data processing upon the primary storage system and reducing migration time. Other features and aspects may be realized, depending upon the particular application.

Split data migration in a data storage system

Various embodiments are provided for identifying matching tape volumes for data deduplication in an automated data storage library by a processor. N most similar tape volumes in a tape library may be matched according to a data indication provided in each volume header of the N most similar tape volumes for performing a data deduplication operation on a reduced block of compressed data between the N most similar tape volumes, wherein N is a positive integer.

Using volume header records to identify matching tape volumes

For maintaining a context stack, a processor monitors a stack size for a stack of a plurality of existing contexts that are not associated to a process of a plurality of processes. Each context is associable and reusable with a plurality of processes and includes a pathway to a data set when not associated to any process of the plurality of processes. The pathway includes a logical volume identifier for the data set, a logical address of the data set within the logical volume, and a logical address of an intervening device. The context defines communications between the process and the data set through the pathway when associated to the process, and each context is returned to the stack when not associated to the process.

Apparatus, system, and method for maintaining a context stack

A computer-implemented method, according to one embodiment, includes: receiving a data volume having data from multiple tenants therein; separating data in the data volume into objects using tenant identifiers from metadata corresponding to portions of the data, wherein each object corresponds to a respective tenant; and storing the objects in object storage. Other systems, methods, and computer program products are described in additional embodiments.

In one embodiment, a computer program product for dynamic volume mounting includes a computer readable storage medium having program instructions embodied therewith. The program instructions are executable by a processing circuit to cause the circuitry to perform a method including receiving, from a host, a command directed to a volume. The command includes a parameter. A policy associated with the host is evaluated. Based on the evaluation, a value of the parameter included in the command is determined. In response to the parameter including a first value, two copies of the volume are opened. The parameter is set to include the first value when the one of the two copies of the volume is already open, and the two copies of the volume are opened in response thereto. In response to the parameter including a second value, only one of the two copies of the volume are opened.

System, method, and computer program product for dynamic volume mounting in a system maintaining synchronous copy objects

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Tucson, AZ, United States of America

Joseph M Swingler